Spiritual warfare is part of Christianity and the spiritual warfare is not over. Historically, the rise and fall of spiritual power within the Church of Christ has been related to the acknowledgement and opposition toward demonic principalities and powers. As leaders recognized the spiritual warfare caused by demon powers they equipped believers to use their delegated spiritual authority to fight back. When leaders ignored the dark rulers of this world believers and the Church suffered.
You are in a spiritual war whether you want to be or not. Jesus did not ignore demon powers and he didn’t teach his apostles to ignore them either (Matthew 10:1). The Apostle Paul taught the church in Ephesus how to battle saying,
“Finally, my brethren, be strong in the Lord, and in the power of his might. Put on the whole armor of God that ye may be able to stand against the wiles of the devil. For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Wherefore take unto you the whole armor of God that ye may be able to withstand (fight back) in the evil day, and having done all, to stand.” (Ephesians 6:10-13)